The bottom line of humor is to be always genuine and to have fun! Forced
humor sounds forced, and even though a false smile is difficult, a forced laugh
always sounds particularly hollow.

Freud saw humor as based in the rush of pleasure comes from sudden release of
tension. Tension is released when because repressed impulses suddenly allowed
expression when the punch-line evades the internal censor (or anti-cathexis) via
the element of surprise. The preponderance of sexual humor also supports a
Freudian view.